package com.hx.haowumall.haowumallsearch.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.hx.common.to.es.SkuEsModel;
import com.hx.common.utils.R;
import com.hx.haowumall.haowumallsearch.Config.HaowumallElasticSearchConfig;
import com.hx.haowumall.haowumallsearch.constant.EsConstant;
import com.hx.haowumall.haowumallsearch.feign.ProductFeignService;
import com.hx.haowumall.haowumallsearch.service.MallSearchService;
import com.hx.haowumall.haowumallsearch.vo.AttrResponseVo;
import com.hx.haowumall.haowumallsearch.vo.BrandVo;
import com.hx.haowumall.haowumallsearch.vo.SearchParam;
import com.hx.haowumall.haowumallsearch.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
        // 动态构建出查询需要的DSL语句

        SearchResult result = null;

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, HaowumallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result = buildSearchResult(response,param);

        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * */
    private SearchRequest buildSearchRequest(SearchParam param) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句
        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         * */
        //1、构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2.1、bool-filer catalogId
        if (param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2.2、bool-filer brandId
        if (param.getBrandId() != null && param.getBrandId().size() > 0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2.3、bool-filer attrs
        if (param.getAttrs()!=null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//检索到这个属性 的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个attrvalue都要生成一个嵌入式查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }

        //1.2.4、bool-filer hasStock
        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

        //1.2.5、bool-filer skuPrice价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] split = param.getSkuPrice().split("_");
//            System.out.println(">>>>"+ JSON.toJSONString(split));
//            System.out.println(">>>>++++"+ split.length);
//            System.out.println(">>>>split[0])<<<<<"+JSON.toJSONString(split[0]));
//            System.out.println(">>>>split[1])<<<<<"+JSON.toJSONString(split[1]));
            if (split.length == 2){
//                System.out.println("uuuuuuuzzzz" + (!StringUtils.isEmpty(split[0])));
                if ( !StringUtils.isEmpty(split[0])){
                    //区间
                    rangeQuery.gte(split[0]).lte(split[1]);
                }else {
                    rangeQuery.lte(split[1]);
                }
            }else if (split.length == 1){
                rangeQuery.gte(split[0]);
            }

            boolQuery.filter(rangeQuery);
        }

        //拼装了所有的条件
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮，
         * */
        //2.1、排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        //2.2、分页(from = (pagenum-1 * PRODUCT_PAGESIZE ))
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         * */

        //TODO 1、品牌ID聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        //品牌聚合的子聚合
        //1.1品牌聚合的子聚合-品牌名字聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        //1.2品牌聚合的子聚合-品牌图片聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //TODO 2、分类ID聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(30);
        //2.1分类聚合 分类名字聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //TODO 3、attrs属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //3.1、attrs属性聚合 属性id聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        //3.1.1、attrs属性聚合 同id属性名字聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_id_name_agg").field("attrs.attrName").size(1));
        //3.1.2、attrs属性聚合 同id属性属性值聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_id_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);


        String s = sourceBuilder.toString();
        System.out.println("构建的DSL:"+s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }


    /**
     * 构建检索数据
     * */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        ArrayList<SkuEsModel> skuEsModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                skuEsModels.add(esModel);
            }
        }
        result.setProducts(skuEsModels);

        //2、返回当前商品涉及到的所有属性信息
        ArrayList<SearchResult.AttrVo> attrVos = new ArrayList<>();

        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            //2.1、得到属性的Id
            long attrId = bucket.getKeyAsNumber().longValue();

            //2.2、得到属性名字
            ParsedStringTerms attr_id_name_agg = bucket.getAggregations().get("attr_id_name_agg");
            String attrName = attr_id_name_agg.getBuckets().get(0).getKeyAsString();

            //2.3、得到属性的所有值
            ParsedStringTerms attr_id_value_agg = bucket.getAggregations().get("attr_id_value_agg");
            List<String> attrValues = attr_id_value_agg.getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);

        //3、返回当前商品涉及到的所有品牌信息
        ArrayList<SearchResult.BrandVo> brandVos = new ArrayList<>();

        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //1、得到品牌ID
            long brandId = bucket.getKeyAsNumber().longValue();

            //2、得到品牌名字
            ParsedStringTerms brand_name_agg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brand_name_agg.getBuckets().get(0).getKeyAsString();

            //3、得到品牌图片
            ParsedStringTerms brand_img_agg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brand_img_agg.getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4、返回当前商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        ArrayList<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到ID
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //=======以上信息从聚合中取得========

        //5、分页信息的-页码
        result.setPageNum(param.getPageNum());

        //7、分页信息的-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //8、分页信息的-总页码
        int totalPages = (int)total%EsConstant.PRODUCT_PAGESIZE == 0?
                (int)total/EsConstant.PRODUCT_PAGESIZE:( (int)total/EsConstant.PRODUCT_PAGESIZE)+1;
        result.setTotalPages(totalPages);

        //9、分页信息的-导航页码
        ArrayList<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //10.1、分页信息的-构建面包屑导航功能（商品属性）
        if (param.getAttrs() != null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1、分析每个attrs传过来的查参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] split = attr.split("_");
                R r = productFeignService.attrInfo(Long.parseLong(split[0]));
                result.getAttrIds().add(Long.parseLong(split[0]));

                if (r.getCode()== 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(split[0]);
                }
                navVo.setNavValue(split[1]);

                //2、取消这个面包屑后，跳转到原始地方
                //拿到请求条件，去掉当前 attrs=15_海思（Hisilicon）

                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.haowumall.com/list.html?"+replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }


        //10.2、分页信息的-构建面包屑导航功能（品牌）
        if (param.getBrandId()!=null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");

            //TODO 远程查询所有品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if (r.getCode() == 0){
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>(){});
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(param,brandVo.getBrandId()+"" ,"brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.haowumall.com/list.html?"+replace);
            }

            navs.add(navVo);
        }

        // TODO 分类

        return result;
    }

    /**
     * 构建结果数据
     * */
    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+","%20");//浏览器对空格的处理和java不同
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.getQueryStringUrl().replace("&"+key+"="+encode, "");
        return replace;
    }


}
